JPH1168903A - Suspension, electro-mechanical-acoustic transducer and portable terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a suspension with high reliability against vibration fatigue and with excellent linearity in an external force versus displacement characteristic by configuring the suspension with a thin plate where a width of its middle part is narrower than that of both supporting ends. SOLUTION: In the case that a side (a) is fixed and a force is applied perpendicularly to a side a', the suspension 1 is deformed in a direction of the force as the force is increased. The suspension 1 is a made of a thin plate with a shape where the width of its middle part is narrower than that of both ends. Thus, the middle part is easily deformed more than the both ends of the suspension 1, and a stress caused when the suspension 1 is deformed is dispersed toward the middle from the both ends of the suspension 1. Thus, the stress produced at the both ends of the suspension 1 is decreased ore than that of a suspension with a uniform width. Furthermore, since the mean width of the suspension 1 is smaller than the width of a suspension with a uniform width, the linearity in a force versus displacement characteristic of the suspension 1 is improved more than that of a suspension with a uniform width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-mechanical-acoustic converter having a shape which suppresses locally generated stress due to a deformation operation and has excellent linearity in displacement characteristics with respect to an external force. Is suitable for the suspension, and the electric and
The present invention relates to a mechanical-acoustic converter and a portable terminal device incorporating the electric-mechanical-acoustic converter.

[0002]

2. Description of the Related Art Conventionally, a portable terminal device such as a portable telephone is provided with a small sounding body for generating a bell sound and a micromotor for causing vibration as means for notifying an incoming call. Further, a receiving speaker is attached to listen to the talk of the other party. In order to reduce the size and weight of the portable terminal device, means for realizing sound generation and vibration with one electric-mechanical-acoustic converter has been devised for the purpose of reducing the number of components.
No. 2 discloses this.

This electric-mechanical-acoustic converter is configured as shown in FIG. The outer periphery of the circular diaphragm 101 is attached to the case 102. Case 10
2 has a bottom plate 103 and a yoke 104 is attached to the bottom plate 103. The suspension 105 is attached to the case 102, and the magnet 106 is supported by the suspension 105. Voice coil 1
07 is inserted into a magnetic gap formed by the inner peripheral surface of the yoke 104 and the outer peripheral surface of the magnet 106, and is attached to the diaphragm 101. Yoke 104 and magnet 106
Constitutes a magnetic circuit unit, and the suspension 105 and the magnet 106 constitute a mechanical vibration system.

[0004]

The electric-mechanical-acoustic converter constructed as described above has a voice coil
The operation will be described by taking as an example a case where the electric signal input to 7 is an alternating current. When an alternating current is input to the voice coil 107, the magnetic field in the magnetic gap exerts a force on the voice coil 107, and a driving force for driving the voice coil 107 (hereinafter, referred to as a driving force) is generated. The diaphragm 101 vibrates by this driving force to generate sound. A reaction force to the driving force generated in the voice coil 107 is generated in the magnetic circuit portion, and the magnet 1 supported by the suspension 105
06 vibrates. This vibration is transmitted to the case 102 via the suspension 105, and the case 102 vibrates.
It should be noted that when the frequency of the current input to the voice coil 107 matches the resonance frequency of the mechanical vibration system, it vibrates most.

[0005] The vibration level of a mechanical vibration system is proportional to the mass and acceleration of the mechanical vibration system. The mass of the magnet 106 constituting the mechanical vibration system is not large and the suspension 1
Since the shape of 05 is annular, the linearity in the displacement characteristics of the suspension 105 with respect to the input level is not sufficient. In the electro-mechanical-acoustic converter of FIG. 18, even when the frequency of the current input to the voice coil 107 is made to coincide with the resonance frequency of the mechanical vibration system, it is not possible to sufficiently increase the vibration level of the mechanical vibration system. Can not. For this reason, when attached to a mobile phone weighing nearly 100 g, it has been difficult to notify the user of an incoming call with a sufficient vibration level.

An object of the present invention is to solve the above-mentioned problems, and to realize an electro-mechanical-acoustic converter capable of extracting a large vibration and having high reliability against vibration fatigue, a displacement characteristic with respect to an external force. It is an object of the present invention to provide a suspension for an electro-mechanical-acoustic converter having excellent linearity and high reliability against vibration fatigue. Also,
The present invention provides a small-sized electro-mechanical-acoustic transducer capable of obtaining a large vibration and reproducing a sound at the same time by using the suspension.
It is an object of the present invention to provide a portable terminal device having a built-in acoustic converter and having an incoming call function by vibration, an incoming call function by sound, and a function of reproducing a received sound.

[0007]

SUMMARY OF THE INVENTION A suspension for an electro-mechanical-acoustic transducer according to the present invention is a thin plate having a shape in which a width at a center portion is narrower than a width at both ends supporting two portions. The above-described suspension has a shape in which the width is substantially continuously reduced from both ends to the center. Alternatively, it has a shape in which the width is linearly and continuously narrowed from both ends to the center. Alternatively, it has a shape in which the width is continuously narrowed with an arc from both ends to the center. Alternatively, the central portion has a fixed width that is narrower than the width at both ends. According to the suspension, it is possible to simultaneously improve the linearity of the displacement characteristic with respect to the force applied to the suspension and reduce the stress generated at the end of the suspension.

[0008] In another aspect, a suspension for an electro-mechanical-acoustic transducer has a shape that substantially conforms to the outer shape of the mount. In the suspension described above, the shape substantially along the outer shape of the attachment is an arc shape. According to the above suspension, a sufficient amount of vibration displacement can be secured, and concentration of stress on the end of the suspension can be prevented.

An electro-mechanical-acoustic transducer according to the present invention comprises a diaphragm, a magnetic circuit portion disposed opposite to the diaphragm, a weight attached to the magnetic circuit portion, and substantially the magnetic circuit portion and the magnetic circuit portion. At least two suspension plates having as arms the above-mentioned suspension supporting a movable portion constituted by a weight, the diaphragm and a support member supporting the suspension plate, and driving the diaphragm and the magnetic circuit unit. Driving means for generating a force. By incorporating the suspension for an electro-mechanical-acoustic transducer of the present invention, a large vibration can be taken out and an electro-mechanical-acoustic transducer having high reliability against vibration fatigue can be realized.

In the above electro-mechanical-acoustic transducer,
The arm of the suspension plate is arranged in the plane of the movable part. With this configuration, the overall shape of the electro-mechanical-acoustic transducer can be reduced.

In the above electro-mechanical-acoustic transducer,
The arm of the suspension plate is arranged out of the plane of the movable part. With this configuration, it is not necessary to cut the weight to provide space for the arms of the suspension plate to vibrate, so that the mass of the movable part including the weight does not decrease, and therefore, the vibration is efficiently transmitted from the electro-mechanical-acoustic transducer. Can be taken out.

In the above electro-mechanical-acoustic transducer,
The driving means is an electrodynamic driving means having a voice coil inserted into a magnetic gap of the magnetic circuit unit and attached to the diaphragm. In another aspect, the driving unit includes:
An electromagnetic driving means includes an excitation coil disposed on the outer periphery of a center pole of the magnetic circuit section, and a magnetic body disposed to face the magnetic circuit section with a gap. With this configuration, an electro-mechanical-acoustic converter that generates vibration and sound in the same unit is obtained.

In the above electro-mechanical-acoustic transducer,
The weight is a material having a specific gravity greater than at least iron. Thereby, the mass of the movable part can be increased without increasing the size of the electric-mechanical-acoustic transducer,
Large vibrations can be extracted from the mechanical-acoustic transducer.

In the above electro-mechanical-acoustic transducer,
Two suspension plates are provided as the suspension plate: a first suspension plate on the movable portion opposite to the diaphragm and a second suspension plate on the movable portion on the diaphragm side. Further, the first suspension plate and the second suspension plate are arranged such that the directions of the arms are orthogonal to each other. By arranging the suspension plate in this way, it is possible to prevent the movable part from tilting when the movable part vibrates.

A portable terminal device according to the present invention includes the above-described electro-mechanical-acoustic converter. In the above-described portable terminal device, the support member is attached to an outer case of the portable terminal device or a circuit board of the portable terminal device. In the above-mentioned portable terminal device, the outer case has at least one air hole, and the electro-mechanical-acoustic transducer is attached with the diaphragm facing the air hole. According to the present invention, a mobile terminal device that generates vibration and sound can be realized.

The above-mentioned portable terminal device comprises: first electric signal generating means for generating electric signals in at least two frequency bands; and switching means for switching electric signals generated by the first electric signal generating means. Prepare. The frequency band of the electric signal is a frequency band of the electric signal for transmitting the incoming call by vibration and a frequency band of the electric signal for transmitting the incoming signal by sound. Alternatively, the frequency band of the electric signal is a frequency band of an electric signal for transmitting an incoming call by vibration, a frequency band of an electric signal for transmitting an incoming call by sound, and a frequency band of an electric signal for reproducing a received sound. If the portable terminal device is configured in this manner, the portable terminal device has an incoming call function by vibration and an incoming call function by sound, or a portable terminal device having the function of incoming call by vibration, incoming call by sound, and reproduction of a received sound. Can be realized.

In the above-mentioned portable terminal device, the frequency band of the electric signal for transmitting the incoming call by vibration is 200 Hz.
It is as follows. The frequency band of the electric signal for transmitting the incoming call by sound is 1 kHz or more. The frequency band of the electric signal for reproducing the received sound is substantially 200 Hz or more. If the frequency is selected as described above, the incoming call by vibration, the incoming call by sound and the reproduction of the received sound can be efficiently performed.
In addition, it can be performed clearly.

According to another aspect of the present invention, the above-mentioned portable terminal device converts the electric signal including a plurality of frequencies within a predetermined frequency range into the electric signal.
A second electric signal generating means for inputting to the mechanical-acoustic converter is provided. Alternatively, there is provided a third electric signal generating means for inputting an electric signal whose frequency changes with time within a predetermined frequency width to the electro-mechanical-acoustic converter. Alternatively, detecting means for detecting a resonance frequency of the electro-mechanical-acoustic converter, and generating a fourth electric signal for inputting an electric signal having the resonance frequency detected by the detecting means to the electro-mechanical-acoustic converter Means. If the portable terminal device is configured as described above, the resonance frequency varies due to mass production of the electro-mechanical-acoustic converter, or the resonance frequency of the electro-mechanical-acoustic converter is changed to the mounting condition of the portable terminal device. Therefore, even if a change occurs, the electric signal can always be efficiently converted into vibration (vibration of the movable portion, vibration of the diaphragm). For example, the center frequency of the predetermined frequency width is selected as a resonance frequency of a mechanical vibration system constituted by the movable part and the suspension plate of the electro-mechanical-acoustic converter.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. << Embodiment 1 >> A suspension for an electric-mechanical-acoustic transducer according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view illustrating an example of a suspension for an electro-mechanical-acoustic converter according to the first embodiment. FIG. 2 shows FIG.
FIG. 2 is a sectional view of the suspension taken along the line II-II ′.
The suspension 1 is, for example, a thin stainless steel plate having a thickness of about 125 μm. The suspension 1 has a shape in which the width decreases linearly and continuously from both ends to the center. For example, when the width at both ends of the suspension 1 is X1, the width at the center is X2, and the total length of the suspension is X3, X1 is 1.3 mm and X2 is 0.3 mm.
25 mm and X3 are 8.5 mm.

The operation and effect of the suspension 1 will be described. The side a is fixed, and a force F is applied to the side a ′ as shown in FIG.
Is vertically applied, the suspension 1 is deformed in the direction of the force as the force F increases. Since the suspension 1 has a shape in which the width of the center is narrower than that of both ends, the center is more easily deformed than the both ends of the suspension. Disperse from the edge toward the center. Therefore,
The stress generated at both ends of the suspension 1 is smaller than that of a suspension having a constant width. Also,
The smaller the width of the suspension is, the more easily the suspension is deformed, and the average width of the suspension 1 is narrower. Therefore, the linearity of the displacement characteristics with respect to the force applied to the suspension is improved as compared with a suspension having a constant width.
As described above, the suspension having a shape in which the width decreases linearly and continuously from the both ends toward the center portion,
Improvement of the linearity of the displacement characteristics with respect to the force applied to the suspension and elimination of the suspension rupture caused by material fatigue due to local concentration of stress, which could not be realized simultaneously with a suspension having a constant width shape. Can be realized simultaneously.

FIG. 3 is a plan view showing another example of the suspension for the electric-mechanical-acoustic converter in the first embodiment. The suspension 1 ′ is, for example, a stainless steel having a thickness of 122 μm. The suspension 1 ′ has a portion having a constant width at the center, and has a shape in which the width from both ends toward the center decreases linearly and continuously. For example, the width of both ends of the suspension 1 'is X4, the width of the central portion is X5, the length of the constant width portion is X6, and the entire length is X7.
X4 is 1.3 mm, X5 is 0.5 mm, X
6 is 2.7 mm and X7 is 8.5 mm. If the value of X6 is shorter than 2.7 mm, stress tends to concentrate on both ends of the suspension. On the other hand, the value of X6 is 2.7 m
If the length is longer than m, the stress tends to concentrate at the center. For this reason, there is an optimal value for the value of X6. The suspension having the shape of FIG. 3 has the same effect as the suspension 1 of FIG.

The suspension shown in FIGS. 1 and 3
The width was linearly and continuously reduced from both ends toward the center. However, as in the case of a suspension 1a shown in FIG. 4A, the shape may be such that the width continuously decreases in an arc from the both ends toward the center. Alternatively, the suspension 1b shown in FIG.
As described above, the overall shape of the suspension may be curved so that the width continuously decreases from both ends toward the center. The suspension having the shapes of FIGS. 4A and 4B has the same effect as the suspension 1 of FIG.

Embodiment 2 A suspension for an electric-mechanical-acoustic converter according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 5 is a perspective view in which suspension plates 53 and 54 are mounted on a movable portion 58 of an electro-mechanical-acoustic transducer described later. The suspension plate 53 includes the movable part 5
8 has a support portion 53a for supporting the movable member 8, two arm portions 53b along the outer periphery of the movable portion 58 and having an arc shape, and two substantially square fixed portions 53c symmetrically positioned with respect to the center of the suspension plate 53. It is formed integrally with a thin plate using. The suspension plate 54 is
It has the same shape as the suspension plate 53. In the suspension plate formed as described above, the arm of the suspension plate can be lengthened on condition that the suspension plate fits in the plane of the movable portion. Therefore, a sufficient amount of displacement with respect to an external force can be secured, and the stress generated at one position of the suspension plate can be reduced. Further, the size of the suspension plate can be reduced as compared with the suspension plate having the suspension shown in the first embodiment as an arm.

<< Embodiment 3 >> An electro-mechanical-acoustic converter according to Embodiment 3 of the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a plan view of the electro-mechanical-acoustic converter according to the third embodiment. FIG. 7A is a cross-sectional view of the electric-mechanical-acoustic converter of FIG. 6 taken along the line VIIA-VIIA '. FIG. 7B shows the electric-mechanical-acoustic converter of FIG.
It is sectional drawing by the VIIB-VIIB 'cross section. (C) of FIG.
FIG. 7 is a sectional view taken along the line VIIC-VIIC ′ of the electro-mechanical-acoustic transducer of FIG. 6. The electro-mechanical-acoustic converter of FIG. 6 is configured as follows. The diaphragm 2 has a circular outer shape, and is attached to the support member 3 at an outer peripheral portion. The diaphragm 2 is, for example, a polycarbonate having a thickness of about 50 μm. The support member 3 has a columnar cavity at the center and a rectangular outer periphery, a rectangular first support portion 3a at two opposite corners of the flat plate portion, and two other corners. It has a rectangular second support portion 3b shorter than the first support portion 3a. The support member 3 is, for example, a glass fiber reinforced resin. The yoke 4 has a cylindrical outer periphery and is a ferromagnetic material such as soft iron, for example. The magnet 5 has a disk shape and is attached to the inner peripheral surface of the yoke 4. The magnet 5 is a permanent magnet such as a ferrite. The plate 6 has a disk shape and is attached to the magnet 5 at a distance from the inner peripheral surface of the yoke 4 so as to face the diaphragm 2. The plate 6 is a ferromagnetic material such as soft iron, for example. The yoke 4, the magnet 5, and the plate 6, which are integrally attached, constitute a magnetic circuit unit 12. In the magnetic circuit section 12, a magnetic gap 30 is formed between the inner peripheral surface of the yoke 4 and the outer peripheral surfaces of the magnet 5 and the plate 6. The weight 7 is a square flat plate having all corners cut into a rectangular shape and having a cylindrical cavity in the center. Further, the weight 7 is provided with an arm 8b of the suspension plate 8 and an arm 9 of the suspension plate 9 so that the weight 7 does not come into contact with suspension plates 8 and 9 described later during vibration.
The portion facing b is cut off. The weight 7 is the yoke 4
It is attached to the outer peripheral surface. The movable part 1 in which the magnetic circuit part 12 and the weight 7 move relative to the support member 3
Constituting No. 3.

The suspension plate 8 has a frame-like support portion 8.
a, an arm portion 8b provided outside two opposite sides of the support portion 8a and having one end attached to the support portion 8a, and a rectangular fixing portion 8c attached to the other end of the arm portion 8b. The arm 8b has a shape in which the width at the center is narrower than the width at both ends shown in the first embodiment and the width is constant at the center. The suspension plate 8 has a support portion 8 a attached to the opposite side of the diaphragm 2 of the weight 7 to support the movable portion 13 including the weight 7, and a fixed portion 8 c is fixed to the first support portion 3 a of the support member 3. ing. The suspension plate 9 has the same shape as the suspension plate 8. For the following explanation,
In the suspension plate 9, portions corresponding to the support portions 8a, the arm portions 8b, and the fixing portions 8c of the suspension plate 8 are referred to as support portions, arm portions 9b, and fixing portions 9c. The suspension plate 9 supports the movable portion 13 including the weight 7 by attaching a support portion to the diaphragm 2 side of the weight 7 so that the arm 9b of the suspension plate 9 is orthogonal to the arm 8b of the suspension plate 8. , The fixing portion 9c is the second support portion 3b of the support member 3.
It is fixed to. The suspension plates 8 and 9 are, for example, stainless steel. Note that the arm 8b of the suspension plate 8 and the arm 9b of the suspension plate 9 are arranged so as to fit within the plane of the movable portion 13 when viewed two-dimensionally. The voice coil 10 is inserted into the magnetic gap 30 of the magnetic circuit section 12 and attached to the diaphragm 2. Voice coil 1
An input terminal 11 to which both ends of the zero coil are connected is provided on the support member 3.

The operation of the electro-mechanical-acoustic converter configured as described above will be described by taking as an example the case where the electric signal input to the voice coil 10 is an alternating current.
When an alternating current is input to the voice coil 10, a magnetic field in the magnetic gap 30 exerts a force on the voice coil 10, and a driving force is generated in the voice coil 10. The magnitude of the driving force changes according to the time change of the alternating current input to the voice coil 10. Therefore, the diaphragm 2 to which the voice coil 10 is attached is vibrated by the driving force,
Generates a sound. On the other hand, the movable part 13 including the magnetic circuit part 12
, A reaction force against the driving force acts, and the movable portion 13 vibrates. This vibration is transmitted to the support member 3 via the suspension plates 8 and 9, and the support member 3 vibrates. In particular, when the frequency of the current input to the voice coil 10 matches the resonance frequency of the mechanical vibration system constituted by the movable part 13 and the suspension plates 8 and 9, the movable part 13 vibrates most. The supporting member 3 also vibrates most. As described above, in this electro-mechanical-acoustic converter, generation of vibration and sound can be realized by the same unit.

The vibration level of the mechanical vibration system is proportional to the product of the mass of the movable part and the acceleration. For this reason, the vibration level of the movable part 13 is larger as the mass of the movable part is larger or the displacement amount of the vibration is larger. Here, since the movable portion 13 is configured by attaching the weight 7 to the magnetic circuit portion 12, the mass of the movable portion 13 increases. Furthermore, the suspension plates 8 and 9 used for the electro-mechanical-acoustic transducer in the third embodiment have excellent linearity of displacement characteristics with respect to external force due to the substantially narrow width of the arms of the suspension plates, and the displacement amount of vibration is small. growing. Therefore, a large vibration can be efficiently extracted from the electro-mechanical-acoustic transducer.
Further, the arms of the suspension plates 8 and 9 are shaped such that the width at the center is smaller than the width at both ends and the width is constant at the center. For this reason, the stress generated in the suspension plates 8 and 9 is dispersed, and the stress generated in one portion of the suspension plates 8 and 9 is reduced. Therefore, it is possible to realize an electro-mechanical-acoustic converter in which the suspension is hardly broken by vibration fatigue. Each suspension plate 8 and 9
Arms are provided at two positions, and the arms of suspension plates 8 and 9 are arranged so as to be orthogonal to each other. Therefore, when the movable section 13 vibrates, the movable section 1
3 can be prevented from tilting, and stable vibration can be extracted from the electro-mechanical-acoustic transducer. The arm portion 8b of the suspension plate 8 and the arm portion 9b of the suspension plate 9 are arranged so as to fit within the plane of the movable portion 13 in a plane.
For this reason, the overall shape of the electro-mechanical-acoustic transducer can be reduced.

Embodiment 4 An electro-mechanical-acoustic converter according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 8 is a plan view of the electro-mechanical-acoustic converter according to the fourth embodiment. FIG. 9 is a cross-sectional view taken along the line IX-IX ′ of the electro-mechanical-acoustic converter of FIG. The electro-mechanical-acoustic converter of FIG. 8 is configured as follows. The diaphragm 14 has a circular shape, and is attached to the support member 15 at an outer peripheral portion. The diaphragm 14 is made of a material having high magnetic permeability such as permalloy having a thickness of about 0.1 mm to 0.2 mm. The support member 15 has a columnar cavity at the center and a rectangular outer periphery, a rectangular first support portion 15a at two opposite corners of the plate portion, and a second support portion at two other corners. It has a rectangular second support portion 15b shorter than the first support portion 15a. The support member 15
For example, glass fiber reinforced resin. The plate 16 has a cylindrical center pole portion 16a and a center pole portion 16a.
It has a shape having a disk-shaped flange portion 16b larger than the diameter of a. The plate 16 includes the center pole 1
The diaphragm 6a is arranged at a distance from the diaphragm 14 so that the side 6a faces the diaphragm 14. The plate 16 is a ferromagnetic material such as soft iron, for example. The magnet 17 has a cylindrical shape, and is attached to the flange portion 16b at an interval from the outer peripheral surface of the center pole 16a of the plate 16. The magnet 17 is a permanent magnet such as a ferrite. The excitation coil 18 is inserted and attached between the center pole portion 16a of the plate 16 and the magnet 17. Plate 16, which is integrally mounted,
The magnet 17 and the exciting coil 18 are
Is configured. Both ends of the excitation coil 18 are connected to input terminals 19 attached to the support member 15. Weight 2
Reference numeral 0 denotes a rectangular flat plate having a columnar cavity at the center, and a flange 16 b of the plate 16 and a magnet 17.
It is attached to the outer peripheral surface. The magnetic circuit portion 23 and the weight 20 constitute a movable portion 24 that moves relatively to the support member 15.

The suspension plate 21 has a frame-like support 2
1a, an arm portion 21b provided outside two opposite sides of the support portion 21a and having one end attached to the support portion 21a, and a rectangular fixed portion 21c attached to the other end of the arm portion 21b
have. The arm portion 21b has a shape in which the width at the center is narrower than the width at both ends shown in the first embodiment, and has a constant width at the center. The suspension plate 21 has a support portion 21a having a weight 2
The fixed portion 21c is fixed to the first support portion 15a of the support member 15 by supporting the movable portion 24 including the weight 20 attached to the opposite side of the zero vibration plate 14. The suspension plate 22 has the same shape as the suspension plate 21. Note that, for the following description, in the suspension plate 22, the support portion 21a of the suspension plate 21 and the arm 2
1b and the portion corresponding to the fixed portion 21c are the support portion and the arm portion 2.
2b and the fixing portion 22c. Suspension plate 22
The supporting portion is attached to the diaphragm 14 side of the weight 20 to support the movable portion 24 including the weight 20 so that the arm portion 22b of the suspension plate 22 is orthogonal to the arm portion 21b of the suspension plate 21. 22c is the second support member 15
Is fixed to the supporting portion 15b. The suspension plates 21 and 22 are, for example, stainless steel. Here, the arm portion 21b of the suspension plate 21 and the arm portion 22b of the suspension plate 22 are arranged so as to be out of the plane of the movable portion 24 in plan view. Unlike the third embodiment, the arm 20b of the suspension plate 21 and the arm 22b of the suspension plate 22 do not come into contact with the weight 20 at the time of vibration, so that it is not necessary to cut the weight 20.

The operation of the electric-mechanical-acoustic converter configured as described above will be described by taking as an example the case where the electric signal input to the exciting coil 18 is an alternating current.
An alternating current is input to the exciting coil 18. The intensity of the combined magnetic field of the magnetic field generated by the magnet 17 and the magnetic field generated by the current flowing through the exciting coil 18 changes according to the time change of the alternating current input to the exciting coil 18. Therefore, the magnitude of the attraction force acting between the magnetic circuit portion 23 and the diaphragm 14 changes in accordance with the time change of the input alternating current. The vibration plate 14 generates a sound by vibrating due to the change in the magnitude of the suction force. On the other hand, a force also acts on the movable portion 24 including the magnetic circuit portion 23 including the magnet 17 and the weight 20, and the movable portion 24 vibrates. This vibration is applied to the support member 1 via the suspension plates 21 and 22.
5, the support member 15 vibrates. In particular, when the frequency of the current input to the excitation coil 18 matches the resonance frequency of the mechanical vibration system constituted by the movable part 24 and the suspension plates 21 and 22, the movable part 24 vibrates most. Therefore, the supporting member 15 also vibrates most.
As described above, the fourth embodiment is similar to the third embodiment.
With the electro-mechanical-acoustic transducer described above, the generation of vibration and sound can be realized by the same unit.

The vibration level of the mechanical vibration system is proportional to the product of the mass of the movable part and the acceleration. Therefore, the larger the mass of the movable part or the larger the displacement of the vibration, the more the movable part 2
The vibration level of No. 4 is large. Here, since the movable portion 24 is configured by attaching the weight 20 to the magnetic circuit portion 23, the mass of the movable portion 24 increases. Further, the suspension plates 21 and 22 used in the electro-mechanical-acoustic transducer in Example 4 have excellent linearity of displacement characteristics with respect to external force due to the substantially narrow width of the arms of the suspension plates, and the displacement amount of vibration is small. growing. Therefore, electrical-mechanical-
A large vibration can be efficiently extracted from the acoustic transducer. The arms of the suspension plates 21 and 22 have a shape in which the width at the center is narrower than the width at both ends and the width is constant at the center. For this reason, the stress generated in the suspension plates 21 and 22 is dispersed, and the suspension plates 21 and 22 are dispersed.
And 22, the stress generated at one location is reduced. Therefore,
It is possible to realize an electro-mechanical-acoustic converter in which suspension breakage due to vibration fatigue hardly occurs. Each of the suspension plates 21 and 22 has such a shape that the arms are opposite to each other at two opposing positions, and is attached so that the arms of the suspension plates 21 and 22 are orthogonal to each other. ing. For this reason, when the movable part 24 vibrates, the movable part 24 is prevented from tilting, and the
Stable vibration can be extracted from the acoustic transducer.
Since the arm portion 21b of the suspension plate 21 and the arm portion 22b of the suspension plate 22 are arranged so as to be planar and out of the plane of the movable portion 24, it is not necessary to cut the weight 20.
Therefore, the mass of the movable part 24 of the electro-mechanical-acoustic transducer can be increased, and large vibration can be more efficiently extracted from the electro-mechanical-acoustic transducer.

Instead of the shapes and arrangements of the suspension plates of the third and fourth embodiments, each suspension plate has an arm in one place, and each suspension plate is positioned so that the arms of the suspension plate are opposed to each other. May be arranged above and below the movable part. Alternatively, the shape of each suspension plate may be the same as in the third and fourth embodiments, and the suspension may be arranged such that the direction of the arm of one of the suspension plates is opposite to that in the third and fourth embodiments. Also in these cases, the movable portion is prevented from tilting when the movable portion vibrates, and stable vibration can be extracted from the electro-mechanical-acoustic converter. In the third and fourth embodiments, the shape of the arm of the suspension plate is such that the width at the center is narrower than the width at both ends and the width has a constant width at the center (FIG. 3). However, the shape of the arm of the suspension plate may be any shape as long as the width at the center is narrower than the width at both ends, such as the shape shown in FIGS. Electricity of Example 4
In the mechanical-acoustic transducer, as in the electric-mechanical-acoustic transducer described in the third embodiment, the arms of the suspension plate may be arranged so as to fit within the plane of the movable portion when viewed in a plan view. Further, in the electro-mechanical-acoustic transducer according to the third embodiment, the arms of the suspension plate are disposed so as to be out of the plane of the movable portion when viewed in a plane as in the electro-mechanical-acoustic transducer described in the fourth embodiment. May be. In the third and fourth embodiments, the electric signal input to the voice coil or the exciting coil is an AC current, but the present invention is not limited to the AC current.

<< Embodiment 5 >> An electro-mechanical-acoustic converter according to Embodiment 5 of the present invention is shown in FIGS.
2 will be described. FIG. 10 is a plan view of an electro-mechanical-acoustic converter according to the fifth embodiment. FIG.
FIG. 3 is a cross-sectional view of the electro-mechanical-acoustic converter of FIG. FIG. 12 is an exploded perspective view of the electro-mechanical-acoustic transducer of FIG. The diaphragm 2 has a circular outer shape, and is attached to the support member 51 at an outer peripheral portion. The diaphragm 2 is, for example, a polycarbonate having a thickness of about 50 μm. The support member 51 has a rectangular outer peripheral portion and a hollow shape in the center. The support member 51 includes a receiving portion 51a to which a fixing portion 53c of the suspension plate 53 described later is attached, and a fixing portion 5 of the suspension plate 54.
4c has a receiving portion 51b to which it is attached. A connection housing with input terminals 56 to which both ends of a coil of the voice coil 10 described later are connected is attached to the support member 51. The support member 51 is, for example, a glass fiber reinforced resin having excellent impact resistance. The outer periphery of the yoke 52 has a cylindrical shape, and is a ferromagnetic material such as soft iron, for example. The magnet 5 has a disk shape and is attached to the inner peripheral surface of the yoke 52. The magnet 5 is a permanent magnet such as a ferrite. The plate 6 has a disk shape and is attached to the magnet 5 at a distance from the inner peripheral surface of the yoke 52 so as to face the diaphragm 2. Plate 6
Is a ferromagnetic material such as soft iron. The yoke 52, the magnet 5, and the plate 6, which are integrally attached,
The magnetic circuit unit 57 is configured. In this magnetic circuit section 57,
A magnetic gap 30 ′ is formed between the inner peripheral surface of the yoke 52 and the outer peripheral surfaces of the magnet 5 and the plate 6. Weight 5
Reference numeral 5 denotes an annular shape, which is attached to the yoke 52.
Further, the weight 55 includes an arm 53b of the suspension plate 53 and a suspension plate 54 such that the weight 55 does not contact the suspension plates 53 and 54 described later during vibration.
The position facing the arm portion 54b is shaved. The magnetic circuit portion 57 and the weight 55 constitute a movable portion 58 that moves relatively to the support member 51.

The suspension plate 53 includes support portions 53a,
Two arms 53 along the outer periphery of the movable part 58 and having an arc shape
b and two substantially quadrangular fixing portions 53c. The suspension plate 53 has a support portion 53 a attached to the weight 55 on the opposite side of the diaphragm 2 to support a movable portion 58 including the weight 55, and a fixed portion 53 c is fixed to the receiving portion 51 a of the support member 51. The suspension plate 54 has the same shape as the suspension plate 53. In addition, for the following description, in the suspension plate 54, the support portions 53a of the suspension plate 53,
A portion corresponding to the arm portion 53b and the fixing portion 53c is a support portion,
They are referred to as an arm 54b and a fixing part 54c. At a position rotated by 90 degrees when viewed in plan with the suspension plate 53, the support portion 54a is attached to the diaphragm 2 side of the weight 55 to support the movable portion 58 including the weight 55, and the fixed portion 54c Are fixed to the receiving portion 51b of the support member 51. The suspension plates 53 and 54 are elastic bodies such as stainless steel and copper alloy having elasticity. Voice coil 1
0 is wound around the voice coil bobbin and the magnetic circuit unit 5
7 is inserted into the magnetic gap 30 ′, and the voice coil bobbin is joined to the diaphragm 2. Both ends of the voice coil 10 are connected to the input terminal 56.

The operation of the electro-mechanical-acoustic converter configured as described above is substantially the same as the operation of the electro-mechanical-acoustic converter in the third embodiment, and thus a detailed description is omitted. The electro-mechanical-acoustic converter according to the fifth embodiment generates vibration and sound in one unit, similarly to the electro-mechanical-acoustic converter according to the third embodiment.

The vibration level of the mechanical vibration system is proportional to the product of the mass of the movable part and the acceleration. For this reason, the vibration level of the movable portion 58 increases as the mass of the movable portion increases or as the displacement of the vibration increases. Here, the magnetic circuit unit 58
Since the movable portion 58 is configured by attaching the weight 55 to the movable portion 58, the mass of the movable portion 58 increases. further,
Under the constraint that the suspension plates 53 and 54 fit in the plane of the movable part 58, the suspension plate 5
3 arm part 53b and suspension board 54 arm part 54b
Is shaped along the outer shape of the movable part 58,
The arm portion of the suspension plate can be lengthened, the linearity of the displacement characteristic with respect to an external force is excellent, and the displacement amount of the vibration increases. Therefore, a large vibration can be efficiently extracted from the electro-mechanical-acoustic transducer. Further, since the arms of the suspension plates 53 and 54 are long, the amount of deformation in the entire arms is small, and the stress generated at one location of the suspension plates 53 and 54 is small. Therefore, it is difficult for the suspension plate to break due to vibration fatigue.
An acoustic transducer can be realized. Also, the suspension plate 53
And 54 at the position where the arms are rotated 90 degrees in a plan view,
Since the movable portion 58 is supported, the movable portion 58 can be prevented from tilting when the movable portion 58 vibrates.

In the second, third and fourth embodiments, it is desirable to use a material having a specific gravity at least larger than that of iron, for example, copper, tantalum, tungsten or the like. If such a material is used, the mass of the movable part of the electro-mechanical-acoustic transducer can be increased without increasing the size of the electro-mechanical-acoustic transducer, and a large vibration can be extracted more efficiently. it can. Although the fifth embodiment is an electrodynamic driving unit using a voice coil, the electromagnetic driving unit using an excitation coil described in the fourth embodiment may be used.

Embodiment 6 A portable telephone provided with the electro-mechanical-acoustic converter described in Embodiments 3 to 5 will be described with reference to FIG. FIG. 13 shows a partial cutaway view of the mobile phone. In FIG. 13, the electro-mechanical-acoustic converter 63 shown in the third to fifth embodiments is provided inside a housing 62 of a mobile phone 61. Electricity-
For example, the mechanical-acoustic converter 63 is configured so that the diaphragm 2 illustrated in FIG. 7 faces a sound hole 64 provided in the housing 62.
2 attached. Further, the mobile phone 61 has a processing circuit (not shown) including an oscillation circuit for oscillating an electric signal for calling by vibration, an electric signal for calling by a ringing sound, and an electric signal in a voice band, and a switching circuit for switching the electric signal. ) Built-in.

The operation of the portable telephone shown in FIG. 13 will be described. Controlled by a processing circuit, at least one of the electrical signals is converted to an electro-mechanical-acoustic transducer 63.
Is input to When the input signal input to the electro-mechanical-acoustic transducer 63 is a signal for calling by vibration, that is, when the input signal includes a frequency component near the resonance frequency of the mechanical vibration system of the electro-mechanical-acoustic transducer 63, As described in Examples 3 to 5, the support member of the electro-mechanical-acoustic transducer 63 vibrates. The vibration of the support member is caused by the housing 6 of the mobile phone 61.
2, the mobile phone 61 vibrates. Therefore, the user having the mobile phone can know the incoming call by the vibration. When the input signal is a ringing electric signal, the diaphragm of the electro-mechanical-acoustic transducer 63 vibrates to generate a ringing sound as described in the third to fifth embodiments. Therefore, the user having the mobile phone can know the incoming call by the ringing tone. If the input signal is in the audio band,
As described in the third to fifth embodiments, electric-mechanical-
The diaphragm of the acoustic transducer 63 vibrates, and reproduces the received sound.
Therefore, the user having the mobile phone can hear the reception sound.

As described above, one electric-mechanical-
By incorporating the acoustic converter into the mobile phone, it is possible to perform incoming call by vibration required for the mobile phone, incoming call by ringing tone, and reproduction of the received sound. In particular, the lower the frequency of vibration, the greater the bodily sensation effect.
The following frequency bands are desirable. In addition, since it is effective to use a frequency band where the sensitivity of the human ear is high as a ringing tone, the frequency of a signal used to notify an incoming call by a ringing tone is a band of 1 kHz or more. Is desirable. Further, from the viewpoint of sound clarity, it is desirable that the frequency of the signal used for the received sound be substantially in a band of 200 Hz or more. The electric-mechanical-acoustic transducer has a mechanical vibration system having a resonance frequency of 20.
What is necessary is just to design so that it may be set to 0 Hz or less.

In the mobile phone of the sixth embodiment, the electro-mechanical-acoustic converter is mounted on the housing of the mobile phone, but it may be mounted on a circuit board inside the mobile phone. Further, in the sixth embodiment, the case where the electro-mechanical-acoustic converter is attached to the mobile phone is used. However, the same effect can be obtained when it is used in a pager or a computer with a transceiver.

Embodiment 7 When the electro-mechanical-acoustic transducers described in Embodiments 3 to 5 are mass-produced, the resonance frequencies of the individual electro-mechanical-acoustic transducers vary somewhat. Further, when the electric-mechanical-acoustic transducer is attached to the portable terminal device, the resonance frequency of the electric-mechanical-acoustic transducer changes depending on the attachment state. The electro-mechanical-acoustic transducer converts the input signal to vibration most efficiently at the resonance frequency due to the sharp resonance. However, if the frequency of the input signal deviates from the resonance frequency, the conversion efficiency decreases. Embodiment 7 Embodiment 7 relates to an embodiment for preventing a reduction in conversion efficiency due to a variation in resonance frequency, and will be described with reference to FIGS. 14, 15 and 16. FIG.

FIG. 14 is a block diagram showing a driving device of the electro-mechanical-acoustic converter. In FIG. 14, the output of the electric signal generator 71 is input to the electro-mechanical-acoustic converter 72 shown in the third to fifth embodiments. As shown in FIG. 15, the electric signal generating device 71 is configured to output a hybrid signal having several frequency components within a predetermined frequency width ΔF centered on the center frequency f. Here, the center frequency f is, for example, the electric-mechanical-acoustic transducer 7.
2 is the resonance frequency of the mechanical vibration system at the time of production, or the resonance frequency of the mechanical vibration system calculated from the design dimensions.
The frequency width ΔF is set so as to include the changed resonance frequency of the mechanical vibration system in consideration of the variation in the resonance frequency of the mechanical vibration system.

The operation of the driving device for an electro-mechanical-acoustic converter configured as described above will be described. When an electric signal for vibrating the movable part of the mechanical vibration system of the electric-mechanical-acoustic transducer 72 is input to the electric signal generator 71,
The electric signal generator 71 inputs a hybrid signal having a plurality of frequency components within the frequency width ΔF to the electric-mechanical-acoustic converter 72. The signal input from the electric signal generator 71 to the electric-mechanical-acoustic converter 72 includes a frequency component having a value very close to the resonance frequency of the mechanical vibration system of the electric-mechanical-acoustic converter 72. Therefore, the electro-mechanical-acoustic converter 72 can convert the input signal into the vibration of the movable part of the mechanical vibration system with high efficiency.

The operation of the driving device when the electric signals output from the electric signal generator 71 are different will be described. Instead of generating the above-described signal, the electric signal generator 71
As shown in FIG. 16, a signal whose frequency changes with time in a range of a predetermined frequency width ΔF around the center frequency f is generated. The center frequency f and the frequency width ΔF are set in the same manner as in FIG. Electricity from the electric signal generator 71
The signal input to the mechanical-acoustic transducer 72 has a time zone that coincides with the resonance frequency of the mechanical vibration system of the electric-mechanical-acoustic transducer 72 during one sweep. Therefore, the electro-mechanical-acoustic converter 72 can convert the input signal into the vibration of the movable part of the mechanical vibration system with high efficiency, and generate large vibration. When the driving device shown in FIG. 14 is incorporated in the portable terminal device, even if the resonance frequency of the mechanical vibration system of the electro-mechanical-acoustic transducer changes due to the attachment condition to the portable terminal device, an incoming call is generated due to large vibration. Can be conveyed. In the seventh embodiment, the center frequency of the electric signal output from the electric signal generator is the resonance frequency of the mechanical vibration system of the electro-mechanical-acoustic converter. However, when the center frequency of the electric signal output by the electric signal generator is the resonance frequency of the vibration of the diaphragm of the electro-mechanical-acoustic transducer,
A loud sound can be efficiently extracted from the electro-mechanical-acoustic transducer.

Embodiment 8 In Embodiment 8, as in Embodiment 7, a change occurs in the resonance frequency of the electro-mechanical-acoustic transducer.
The present embodiment relates to an embodiment for preventing the conversion efficiency from deteriorating, and will be described with reference to FIG. FIG.
1 is a block diagram of a resonance frequency detecting device of an electro-mechanical-acoustic transducer. The output of the electric signal generator 81 is input to the electro-mechanical-acoustic converter 82 shown in the third to fifth embodiments. The detection device 83 detects the resonance frequency of the mechanical vibration system of the electric-mechanical-acoustic converter 82 and inputs the detected resonance frequency to the electric signal generator 81. The operation of the resonance frequency detecting device for an electric-mechanical-acoustic transducer configured as described above will be described. The detection device 83 is an electric-
The resonance frequency of the mechanical vibration system of the mechanical-acoustic converter 82 is detected. The detection device 83 inputs the detected resonance frequency to the electric signal generation device 81. The electric signal generator 81 inputs the electric signal having the resonance frequency input from the detection device 83 to the electric-mechanical-acoustic converter 82. As described above, the frequency of the electric signal input to the electric-mechanical-acoustic converter 82 is adjusted to the resonance frequency of the mechanical vibration system of the electric-mechanical-acoustic converter 82. Therefore, electricity-
The mechanical-acoustic converter 82 can convert an electric signal into vibration of a movable portion of a mechanical vibration system with high efficiency. When the resonance frequency detecting device shown in FIG.
Even if the resonance frequency of the mechanical vibration system of the mechanical-acoustic transducer changes due to its attachment condition to the portable terminal device,
Due to the large vibration, the incoming call can be transmitted reliably. In the eighth embodiment, the resonance frequency detected by the detection device is the resonance frequency of the mechanical vibration system of the electric-mechanical-acoustic converter. However, when the resonance frequency detected by the detection device is the resonance frequency of the vibration of the diaphragm of the electro-mechanical-acoustic converter, a loud sound can be efficiently extracted from the electro-mechanical-acoustic converter.

[0047]

According to the present invention, it is possible to realize a suspension having both excellent linearity of displacement characteristics and low stress, which are contrary to each other in a suspension having a constant width. By using the suspension of the present invention for an electro-mechanical-acoustic converter, it is possible to realize an electro-mechanical-acoustic converter capable of extracting large vibration and having high reliability against vibration fatigue. Further, the electro-mechanical-acoustic transducer of the present invention can generate vibration and sound in a single unit. By using the electro-mechanical-acoustic transducer of the present invention in a portable terminal device, only by incorporating a single unit (electro-mechanical-acoustic transducer),
It is possible to realize a portable terminal device having an incoming call function by vibration, an incoming call function by sound, and a function of reproducing a received sound.

[Brief description of the drawings]

FIG. 1 is a plan view showing a suspension according to a first embodiment.

FIG. 2 is a sectional view taken along the line II-II ′ of the suspension of FIG. 1;

FIG. 3 is a plan view showing another suspension according to the first embodiment.

FIG. 4A is a plan view showing still another suspension in the first embodiment, and FIG. 4B is a plan view showing still another suspension in the first embodiment.

FIG. 5 is a perspective view showing a suspension according to a second embodiment.

FIG. 6 is a plan view illustrating an electro-mechanical-acoustic converter according to a third embodiment.

7A is a cross-sectional view of the electro-mechanical-acoustic converter of FIG. 6 taken along the line VIIA-VIIA ′, and FIG. 7B is an electro-mechanical-acoustic converter of FIG. VIIB-VII
It is sectional drawing by B 'cross section, and FIG.7 (c) is sectional drawing by VIIC-VIIC' cross section of the electro-mechanical-acoustic converter of FIG.

FIG. 8 is a plan view illustrating an electro-mechanical-acoustic converter according to a fourth embodiment.

9 is a cross-sectional view of the electro-mechanical-acoustic transducer of FIG. 8 taken along the line IX-IX '.

FIG. 10 is a plan view illustrating an electro-mechanical-acoustic converter according to a fifth embodiment.

11 is an XI-X of the electro-mechanical-acoustic transducer of FIG.
It is sectional drawing by I 'cross section.

FIG. 12 is an exploded perspective view of the electro-mechanical-acoustic converter of FIG. 10;

FIG. 13 is a partial cutaway view of a mobile phone equipped with an electro-mechanical-acoustic converter according to a sixth embodiment.

FIG. 14 is a block diagram of a driving device of an electro-mechanical-acoustic converter according to a seventh embodiment.

FIG. 15 is a diagram illustrating a frequency characteristic of an output signal of the electric signal generator.

FIG. 16 is a diagram showing a time characteristic of an output signal of the electric signal generator.

FIG. 17 is a block diagram of a resonance frequency detecting device of an electro-mechanical-acoustic converter according to an eighth embodiment of the present invention.

FIG. 18 is a cross-sectional view of a conventional electro-mechanical-acoustic transducer.

[Explanation of symbols]

 2 Vibration plate 3 Support member 4 Yoke 5 Magnet 6 Plate 7 Weight 8, 9 Suspension plate 10 Voice coil 11 Input terminal 12 Magnetic circuit unit 13 Movable unit

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[Procedure amendment]

[Submission date] May 15, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 9

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 10

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

In the above electro-mechanical-acoustic transducer,
The arm of the suspension plate is arranged in the plane shape of the movable part in its plane shape . With this configuration, the overall shape of the electro-mechanical-acoustic transducer can be reduced.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

In the above electro-mechanical-acoustic transducer,
The arm of the suspension plate is disposed outside the plane shape of the movable portion in its plane shape . With this configuration,
Since it is not necessary to cut the weight to provide a space for the arms of the suspension plate to vibrate, the mass of the movable part including the weight does not decrease, so that the vibration can be efficiently extracted from the electro-mechanical-acoustic transducer. .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

The operation and effect of the suspension 1 will be described. The side a is fixed, and a force F is applied to the side a ′ as shown in FIG.
Is vertically applied, the suspension 1 is deformed in the direction of the force as the force F increases. Since the center of the suspension 1 is narrower at both ends than at both ends, the center of the suspension 1 is more easily deformed than both ends of the suspension 1 ,
Stress suspension 1 is generated when deformation is dispersed in central direction from the end portion of the support <br/> scan pension 1. Therefore, the stress generated at both ends of the suspension 1 is smaller than that of a suspension having a fixed width. In addition, the smaller the width of the suspension, the more easily the suspension is deformed, and the average width of the suspension 1 is reduced. Therefore, the suspension has a smaller force applied to the suspension 1 than a suspension having a fixed width. The linearity of the displacement characteristics is improved. As described above, the suspension 1 having the shape in which the width decreases linearly and continuously from both ends toward the center is added to the suspension which cannot be realized at the same time by the suspension having the constant width. The improvement of the linearity of the displacement characteristic with respect to the force and the elimination of the breakage of the suspension caused by the material fatigue due to the local concentration of the stress can be realized at the same time.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

FIG. 3 is a plan view showing another example of the suspension for the electric-mechanical-acoustic converter in the first embodiment. The suspension 1 ′ is, for example, a stainless steel having a thickness of 122 μm. The suspension 1 ′ has a portion having a constant width at the center, and has a shape in which the width from both ends toward the center decreases linearly and continuously. For example, the width of both ends of the suspension 1 'is X4, the width of the central portion is X5, the length of the constant width portion is X6, and the entire length is X7.
X4 is 1.3 mm, X5 is 0.5 mm, X
6 is 2.7 mm and X7 is 8.5 mm. If the value of X6 is shorter than 2.7 mm, the stress
There is a tendency to concentrate at both ends of 1 ' . On the other hand, when the value of X6 is longer than 2.7 mm, the stress tends to concentrate on the central portion. For this reason, there is an optimal value for the value of X6. The suspension 1 ' having the shape of FIG.
Has the same effect as the suspension 1 of the first embodiment.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

The suspensions 1 and 2 shown in FIGS.
1 ′ had a shape in which the width decreased linearly and continuously from both ends to the center. However, FIG.
As shown in a suspension 1a, the width may be continuously reduced from both ends toward the center with an arc. Alternatively, as in the case of a suspension 1b shown in FIG. 4B, the overall shape of the suspension may be a curved shape such that the width continuously decreases from both ends toward the center. The suspensions 1a and 1b having the shapes of FIG. 4A and FIG. 4B have the same effects as the suspension 1 of FIG.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

Embodiment 2 A suspension for an electric-mechanical-acoustic converter according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 5 is a perspective view in which suspension plates 53 and 54 are mounted on a movable portion 58 of an electro-mechanical-acoustic transducer described later. The suspension plate 53 includes the movable part 5
8 has a support portion 53a for supporting the movable member 8, two arm portions 53b along the outer periphery of the movable portion 58 and having an arc shape, and two substantially square fixed portions 53c symmetrically positioned with respect to the center of the suspension plate 53. It is formed integrally with a thin plate using. The suspension plate 54 is
It has the same shape as the suspension plate 53. In the suspension plate formed as described above, the arm of the suspension plate can be lengthened on condition that the suspension plate can be accommodated in the plane of the movable portion. Therefore, a sufficient amount of displacement with respect to an external force can be secured, and the stress generated at one position of the suspension plate can be reduced. Example 1
The size of the suspension plate can be made smaller than that of the suspension plate having the suspension as an arm.

Claims (28)

[Claims] 1. A thin plate electro-mechanical-acoustic transducer suspension having a shape in which a width at a center portion is narrower than a width at both ends supporting two portions. 2. The suspension for an electro-mechanical-acoustic converter according to claim 1, wherein the suspension has a shape in which a width is substantially continuously reduced from both ends to a central portion. 3. The electric-mechanical device according to claim 2, wherein the width is linearly and continuously narrowed from both ends to a central portion.
Suspension for acoustic transducer. 4. The electric-mechanical device according to claim 2, wherein the width is continuously narrowed with an arc from both ends to a central portion.
Suspension for acoustic transducer. 5. The suspension for an electro-mechanical-acoustic transducer according to claim 2, wherein the central portion has a constant width narrower than the widths at both ends. 6. A suspension for an electro-mechanical-acoustic transducer having a shape substantially conforming to the outer shape of the attachment. 7. The suspension for an electro-mechanical-acoustic transducer according to claim 6, wherein the shape substantially along the outer shape of the attachment is an arc shape. 8. A vibrating plate, a magnetic circuit portion disposed opposite to the vibrating plate, a weight attached to the magnetic circuit portion, and a movable portion substantially comprising the magnetic circuit portion and the weight are supported. 7. At least two suspension plates having the suspension according to claim 1 or 6 as an arm, a supporting member for supporting the diaphragm and the suspension plate, and a force for driving the diaphragm and the magnetic circuit unit. An electro-mechanical-acoustic transducer comprising: a driving means for generating. 9. The electro-mechanical-acoustic converter according to claim 8, wherein the arm of the suspension plate is disposed in a plane of the movable part. 10. The electro-mechanical-acoustic converter according to claim 8, wherein the arm of the suspension plate is arranged out of the plane of the movable part. 11. The electro-mechanical device according to claim 8, wherein the driving unit is an electrodynamic driving unit having a voice coil inserted into a magnetic gap of the magnetic circuit unit and attached to the diaphragm. An acoustic transducer. 12. An electromagnetic type driving means, wherein said driving means has an exciting coil disposed on an outer periphery of a center pole of said magnetic circuit part, and a magnetic body provided with a gap with said magnetic circuit part. The electro-mechanical-acoustic converter according to claim 8, wherein: 13. The electro-mechanical-acoustic converter according to claim 8, wherein the weight is a material having a specific gravity larger than at least iron. 14. Two suspension plates as the suspension plate: a first suspension plate of the movable portion opposite to the diaphragm, and a second suspension plate of the movable portion on the diaphragm side. The electro-mechanical-acoustic transducer according to claim 9 or 10, wherein: 15. The electro-mechanical-acoustic converter according to claim 14, wherein the first suspension plate and the second suspension plate are arranged such that the directions of the arms are orthogonal to each other. 16. A portable terminal device incorporating the electric-mechanical-acoustic converter according to claim 8. 17. The portable terminal device according to claim 16, wherein the support member is attached to an outer case of the portable terminal device or a circuit board of the portable terminal device. 18. The mobile terminal according to claim 17, wherein the outer case has at least one air hole, and the electro-mechanical-acoustic transducer is mounted with the diaphragm facing the air hole. apparatus. 19. A system according to claim 16, further comprising: first electric signal generating means for generating electric signals in at least two frequency bands; and switching means for switching electric signals generated by said first electric signal generating means. A mobile terminal device according to claim 1. 20. The mobile terminal device according to claim 19, wherein the frequency band of the electric signal is a frequency band of an electric signal that transmits an incoming call by vibration and a frequency band of an electric signal that transmits an incoming call by sound. 21. The frequency band of the electric signal is a frequency band of an electric signal for transmitting an incoming call by vibration, a frequency band of an electric signal for transmitting an incoming call by sound, and a frequency band of an electric signal for reproducing a received sound. 20. The mobile terminal device according to 19. 22. The portable terminal device according to claim 20, wherein a frequency band of the electric signal for transmitting the incoming call by vibration is 200 Hz or less. 23. The portable terminal device according to claim 20, wherein a frequency band of the electric signal for transmitting the incoming call by sound is 1 kHz or more. 24. The portable terminal device according to claim 21, wherein a frequency band of the electric signal for reproducing the reception sound is substantially 200 Hz or more. 25. The portable terminal device according to claim 16, further comprising a second electric signal generating means for inputting an electric signal including a plurality of frequencies within a predetermined frequency width to the electro-mechanical-acoustic converter. . 26. The portable device according to claim 16, further comprising third electric signal generating means for inputting an electric signal whose frequency changes with time within a predetermined frequency width to the electro-mechanical-acoustic converter. Terminal device. 27. The center frequency of the predetermined frequency width is:
The mobile terminal device according to claim 25 or 26, wherein a resonance frequency of a mechanical vibration system including the movable part and the suspension of the electro-mechanical-acoustic converter is set. 28. A detecting means for detecting a resonance frequency of the electro-mechanical-acoustic converter, and a fourth electric signal for inputting an electric signal of the resonance frequency detected by the detecting means to the electro-mechanical-acoustic converter. The mobile terminal device according to claim 16, comprising: signal generation means.